Go patch committed: A type conversion of a constant need not be const

[Ian Lance Taylor]

In Go a type conversion of a constant is not necessarily itself a
constant, as in []byte(nil).  This patch fixes the Go frontend to
recognize that.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.  Will commit to 4.8
branch when it reopens.

Ian

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